Changes in the Non-Photochemical Quenching of Chlorophyll Fluorescence During Aging of Wheat Flag Leaves |
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| Authors: | S.-S. Hong T. Hong H. Jiang D.-Q. Xu |
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| Affiliation: | (1) Shanghai Institute of Plant Physiology, Chinese Academy of Sciences, 300 Fenglin Road, Shanghai, 200032, The People's Republic of China |
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| Abstract: | Non-photochemical quenching of chlorophyll fluorescence (qN) and its three components (qNf, qNm, and qNs) in the flag leaves of wheat grown in the field were studied by a fluorometer PAM-2000 on clear days. The diurnal variation patterns of qN in just fully extended (JFEL) and aging leaves (AL) were similar, but qNm declined markedly in JFEL while it remained at a relatively high level in AL under strong sunlight at noon. Furthermore, at midday qNf was higher than qNs in JFEL, but much lower in AL. The results show the relative contributions of different mechanisms in preventing the photosynthetic apparatus from photodamage change during leaf development. This revised version was published online in June 2006 with corrections to the Cover Date. |
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| Keywords: | diurnal variation photoinhibition photosystem 2 reaction centres state transition trans-thylakoid membrane proton gradient Triticum aestivum xanthophyll cycle |
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